Punching and shearing machine



(No Model.)

Patented May 17, 1892.

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UNITED STATES PATENT OFFICE.

GEORGE WV. ROCKENFIELD, OF PARKERSBURG, EST VIRGINIA.

PUNCHING AND SHEARING MACHINE.

SPECIFICATION forming part of Letters Patent No. 474,971, dated May 17, 1892. Application filed May 6, 1891- Serial No, 391,715. (No model.)

To all whom it may concern.-

Be it known that I, GEORGE W. RooKEN- FIELD, of Parkersburg, in the county of Wood and State of West Virginia, have invented a new and useful Improvement in Punching and Shearing Machines, of which the following is a specification.

My invention relates to an improvementin punching and shearing machines, and more particularly to machines of the above character which are adapted to operate upon saws of various kinds for gumming, cutting, &c.

The object of my presentinvention is to provide a punching and shearing machine compact and simple in its structure and adapted to be rotated to bring either the punching or shearing tools into the desired position with respect to the work to be operated upon while the latter is held at the desired level to be operated upon.

A further object is to provide simple means for compensating for the wear of the tools and for holding the work at the proper relation thereto.

A practical embodimentof my invention is represented in the accompanying drawings, in which Figure l is a side view, a portion of the machine being broken away to more clearly show the arrangement for retracting the die; and

.Fig. 2 is a top plan view on line 00 xof Fig. 1,

thelower shear-blade being removed.

A is the bed-plate, which may be attached to a bench in any well-known manner. Permanently attached to the bed-plate A is a pivot a, on which the machine is mounted to. freely rotate. A curved upwardly-extending rim at the margin of the bed-plate is provided with an outwardly-projected flange a about on a level with the cutting-faces of the tools. The bed-plate is also provided with pin or bolt holes a adapted to receive a pin or bolt a which passes through the base of the machine, thereby rigidly holding the same in any required position. Instead of these bolt-holes I may provide a continuous semicircular slot, through which the bolt a may pass. The bolt may be fastened by a nut, as is common.

li represents the base of the machine,which is preferably oblong in shape. It is provided with flanges I), through which the adjustingbolt a passes. A die-holder C is situated near one end of the base B, and ashear-holder D is situated near the opposite end. A die 0 is shown secured in the holder 0 in the present instance by means of set-screws c. The shearholder 0 is set diagonally across the base and has one shear-blade cl, secured therein in the present instance by means of setscrews 01. The base B is permanently attached'to the superstructure E by means of a' neck E, into which the pivot a projects through the middle portion of the base. The parts E, F, and B are preferably cast in one piece. The superstructure E consists of two plates e and e, uprising from the plate e at the upper end of the neck F. Cams H and H are mounted upon suitable supports G G between the upper ends of the plates e e, the said cams being provided with operating-levers h h. The cams H H operate the punches and shears.

upper ends with removable bearing-pieces I, so that whenever the punch or shear is shortened by wear or otherwise it may be compensated for by inserting a thicker piece and so causing the cams to give the proper throw. The'punch and shear holders J K are square in cross-section and are inserted diagonally between the plates 6 e. The upper parts of the holders are secured in a sliding position between inner and outer sections of angular boxes L L M M. The lower parts are secured by recessing the base c and then socuring the angular box-sections N N. Lugs 0 0 o 0 are cast on the outside of the plates e e. The angular boxes are secured to the plates by means of bolts or screws 19 p 10 p passing through flanges on said boxes and into thelugs. The bottom ofthe punch-holder J is recessed to receive the shank of a punch thereto.

Between the plates 66' are mounted springretractors, which are constructed as follows: A post q is fixed to the plate (2 in any suitable man-ner. On the top of this postis mounted abar' or rod q','one end of which enters a recess (1 in the punch or shear holder and the other end is attached to a retracting-spring g which springis made strong enough to re- The punch-holder is denoted by vJ and the holder for the upper blade of the shears by K. They are each provided at their y. The shear-holder K has the upper bladek either cast integrally therewith or fastened.

The combination, with an elevated flange adapted forforming the work-support, of apunching'and shearing ma- I 5 chine pivotally secured to the bed-plate and having the cutting-faces of its tools substantially in the plane of the elevated flange of h edrp ate, anim ns fo ad g the punching and shearing machinein rotary ad- 20 justment, substantially as set forth.

GEORGE W. ROOKENFIELD.

\Vitnesses:

.H. J. Enema,

0. J. HULL. 

